Connect to the troubleshooting VM. Open Computer management > Disk management. Make sure that the OS disk is online and that its partitions have drive letters assigned.

Identify the Boot partition and the Windows partition. If there's only one partition on the OS disk, this partition is the Boot partition and the Windows partition.

If the OS disk contains more than one partition, you can identify them by viewing the folders in the partitions:

The Windows partition contains a folder named "Windows," and this partition is larger than the others.

The Boot partition contains a folder named "Boot." This folder is hidden by default. To see the folder, you must display the hidden files and folders and disable the Hide protected operating system files (Recommended) option. The boot partition is typically 300 MB~500 MB.

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Step 2: Repair the ﻿Boot Configuration data

Run the following command line as an administrator, and then record the identifier of Windows Boot Loader (not Windows Boot Manager). The identifier is a 32-character code and it looks like this: xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. You will use this identifier in the next step.

bcdedit /store <Boot partition>:\boot\bcd /enum

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Repair the Boot Configuration data by running the following command lines. You must replace these placeholders by the actual values:

Note This step is applied to most Boot configuration data corruption issues. You need perform this step even if you see the Device and OSDevice are pointing to the correct partition.

<Windows partition> is the partition that contains a folder named "Windows." <Boot partition> is the partition that contains a hidden system folder named "Boot."<Identifier> is the identifier of Windows Boot Loader you found in the previous step.